1/3 to 1/2 cup milk, depending on
consistency needed 3 Tbsp powdered Dream Whip (powdered whipped
topping mix made by Kraft Foods) 2-3 Tbsp clear vanilla,
depending on personal taste (optional: almond extract, or lemon
extract )2 lbs. powdered pure cane sugar IndyDebi says:
“There's no wrong way to mix this. I usually mix all but the
powdered sugar & milk for a minute or two, then gradually
alternate the sugar & milk, but the only reason I do this is to
avoid the "sugar-splash" factor. The longer the mixer runs,
the smoother it gets. Sifting the powdered sugar before blending
helps with smoothness but is not necessary.”

NOTE: Based on recommendations
from other users of her recipe: 1) I make a double batch so the
beaters are totally immersed to avoid air bubbles, 2) I beat the
shortening, milk, Dream Whip, and vanilla for 10-15 minutes BEFORE I
add the powdered sugar. I refrigerate or freeze leftover icing.